BiFeO3-doped Na0.47Bi0.47Ba0.06TiO3 lead-free ceramics were prepared by a solid state reaction method. The ceramics obtained were annealed in a nitrogen atmosphere (N2) and dipped in hydrogen peroxide ambient (H2O2). The different processes of the oxygen treatment had an obvious effect on the X-ray diffraction (XRD) peak positions of the ceramics. No obvious variation in the microstructure was found between the N2-annealed and H2O2-dipped ceramics. The changes in the dielectric property of the ceramics with different processes of oxygen treatment are discussed according to the variation of the oxygen vacancy concentration.

Keywords: Bismuth sodium titanate, Structure, Dielectric property, Oxygen treatment.